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CVE PROGRAM SOURCE RECORDUnscored

CVE-2026-90270

arm_mpam: Disable driver unbind to avoid UAF

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Status
Published
Published
Updated
Assigning organization
Linux

Description

In the Linux kernel, the following vulnerability has been resolved: arm_mpam: Disable driver unbind to avoid UAF When a user unbinds an MSC and that MSC is the only MSC left for a component then the corresponding mpam_component will be freed. If the user then goes on to read the schemata file in the resctrl filesystem then the mpam_component will be accessed from resctrl_arch_get_config() leading to a use after free. As the MPAM driver is not a module the unbind sysfs interface is the only way to trigger the remove. Instead of dealing with the complexity of allowing some unused MSC to unbind just remove the unbind sysfs interface.

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • f04046f2577a5c76167333ca99d3903ee5331ba0 to < 7d199b6a0651abad3ca6d0877dbedbe8fe6ea9e2affected
  • f04046f2577a5c76167333ca99d3903ee5331ba0 to < bb1a0f582d519c0461b0940116e2b52c5ba31459affected

Linux Linux

Default version status: affected

  • 6.19affected
  • 0 to < 6.19unaffected
  • 7.2.6 to ≤ 7.2.*unaffected
  • 7.3 to ≤ *unaffected

References